Denture



l. G. NicHoLs DENTURE Aug. 28, 1923. 1 .1-,466.543

Original Filed June 24 1921 INVENTOR ATTORNEY Patented Aug. 28, 1923.

YUNITED STATES. PA'TE c 1,466,543 Nr OFFICE.

IRA G. NICHOLS, OF MANDAN, NORTH DAKOTA.

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Application filed June 24, 1921, Serial No, 480,119; Renewed May 15, 1923.

To all whom it may concern: 7 I

Be it known that I, IRA G. NIoHoLs, a Cit? izen of the United States, residing atMandan, in the county of Morton and State of North Dakota, have invented new and use ful Improvements in Dentures, of which. the following is a specification. 1 This invention relates to improvements in removable dentures, the general object of the invention being to provide means for movably connecting the denture to'a tooth so that the denture can have limlted movement in relation to the tooth so as to re'-.

lieve the tooth from undue strain caused by the tendency of the denture to move under mastication of food.

This object is secured by providing a cylinder and piston arrangement for connecting the denture to the tooth, the cylinder being closed to prevent food from entering the same.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illus trated in the accompanying drawings and specifically pointed out in the appended claims.

In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which t Figure 1 is a perspective view showing one way of carrying out the invention.

Figure 2 is a similar View with the parts detached.

Figure 3 is an enlarged sectional View of the cylinder and piston device.

Figure 4 is a view of a modified form of piston.

In these views 1 indicates a two-part denture, the two plates A and B of which carry the restoration or false-teeth C and are connected together by the bar 2. Adjacent each end of this bar a projection 3 is located which will hereinafter be referred to as a piston. A bar 4 is provided which carries the clasps 5 for engagement with the natural teeth (not shown) of the patient; these teeth serving as abutment teeth from which the plates are supported. This bar also carries the cylinders 6 which are adapted to receive the pistons 3.

When the bar 4: is connected with the abutment teeth, the inner open ends of the cylinders 6 are presented toward the abutment teeth to ,which attached, the piston, attachments allow for the restoration, that is, plates A and B, to move toward the alveolar borders without bringing any undue stress upon the abutmentteetlr-from which the cylinders are supported. This will relieve the teethto whichthe clasps are con-.-

nected of strainwhile masticating food and ail: the same time hold the bridgework in p ace. v I I The outer end of each cylinder is closed to prevent food from entering the same and a collar 7 is formed on each piston which acts as a stop against the open end of the cylinder to prevent the bottom of the piston from striking the bottom of the cylinder, a small space being left between the bottom of the piston and the bottom of the cylinder when the collar is in engagement with the end of the cylinder. The piston may be made either of cylindrical shape or of tapered shape, the tapered piston being shown in Figure 4. WVhen the cylindrical piston is used a groove 7 is formed therein to prevent the formation of a vacuum in the cylinder which would be apt to prevent movement of the parts.

In practice, the attachment is applied in the following manner. The bar 2 is arranged crosswise of a dental mold upon which the restoration plates A and B are to be formed, and bar 4 is arranged over bar 2 with the cylinders engaging over pistons 3, as shown in Figure 1. The clas s 5 are then suitably anchored to the mol to hold the attachment in place and plates A and B are then formed or built up on each side of the mold and moulded onto the ends of bar 2, as seen in Figure 3. As thus completed the device consists of the clasp bar 4 and the removable denture or bridgework, which, in the present instance, includesthe bar 2 which carries the restoration A and B or lost part which has been replaced. The

advantage of the piston and cylinder attachsequently, it prevents a strain or undue strain on the abutment teeth Which is disastrous and later means the loss of the teeth.

I desire it to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall Within the scope ofthe appended claims.

\Vhat I claim is :Q-

1. A removable denture attachment comprising a resilient bar having clasps associated therewith for engaging abutment teeth and presenting vertical cylinders, a denture or restoration part, and a spring bar carrying said part and having vertical pistons engageable in the said vertical cylinders of the other bar.

2. A removable denture attachment comprising a curved resilient bar having clasps at each end for engagement with abutment teeth a vertical cylinder extending from each end of the said bar adjacent aclasp thereof a two-part denture, and a spring bar connecting the parts of the said denture and curved in conformity With the first mentioned bar, said last mentioned bar having vertical pistons slidably engaged in the said vertical cylinders.

3. A removable denture attachment comprising an upper and a lower resilient bar, clasps carried by one bar for securing the same to abutment teeth, a vertical. cylinder carried by each clasp, vertical pistons carried by the other bar and Working in the said cylinders said pistons being shouldered at the bottom to provide stops for abutment With the said cylinders and limiting the movement of the pistons therein to provide an air space at the inner end or" the piston, said piston-carrying bar serving as a carrier or support for a restoration.

In testimony whereof I aflix my signature.

IRA e. NICHOLS. 

